Dynamic Hybrid ARQ Sub-Packet Limit Adjustment
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Solution Overview
Problem
Conventional Hybrid ARQ systems face challenges in managing transmission quality degradation, leading to persistent queuing and quality degradation, especially under degraded RF conditions or system overload, which results in significant quality issues for real-time applications like VoIP and interactive video.
Innovation Solution
A system and method for dynamically adjusting the maximum number of Hybrid ARQ transmissions by detecting transmission quality degradation and reducing the number of sub-packets transmitted, allowing for early termination and preventing queuing, which is implemented in wireless systems such as EV-DO, HSDPA, and CDMA 2000.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the maximum number of Hybrid ARQ sub-packets is increased to ensure reliable packet delivery under degraded conditions, then reliability improves, but queuing increases and system throughput decreases
Solution Approach 1:
The patent implements dynamic adjustment of the maximum Hybrid ARQ sub-packet count based on real-time transmission quality conditions. When degradation is detected, the system reduces the maximum sub-packet limit to prevent queuing, while normally operating at higher limits to ensure reliable delivery. This dynamic parameter adjustment resolves the contradiction by adapting the reliability-throughput tradeoff to current channel conditions.
Solution Approach 2:
The system changes the parameter of maximum Hybrid ARQ sub-packet count based on transmission quality indicators. By monitoring channel conditions and adjusting this parameter dynamically, the system maintains reliable packet delivery when needed while preventing excessive queuing that would reduce overall system throughput during normal operation.
2Reliability
If the maximum number of Hybrid ARQ sub-packets is increased to ensure complete packet transmission, then reliability improves, but transmission time increases causing queuing
Solution Approach 1:
The patent dynamically adjusts the maximum sub-packet count based on transmission quality, reducing it when degradation is detected to prevent excessive transmission time and queuing. This resolves the contradiction by adapting the transmission completeness guarantee to current channel conditions, ensuring reliability when needed while minimizing delay during normal operation.
Solution Approach 2:
The system proactively reduces the maximum sub-packet limit when transmission quality degradation is detected, before queuing can occur. This preventive adjustment cushions against the potential time loss and queuing that would result from attempting to transmit complete packets under degraded conditions.
3Productivity
If early termination is implemented to increase system throughput, then productivity improves, but reliability decreases under degraded transmission conditions
Solution Approach 1:
The patent implements dynamic control of early termination by adjusting the maximum sub-packet count based on transmission quality. Under normal conditions, early termination is allowed to maximize throughput. When degradation is detected, the system reduces the maximum sub-packet limit to ensure complete packet transmission, thereby maintaining reliability while still allowing throughput optimization during good conditions.
Solution Approach 2:
The system uses feedback from transmission quality monitoring to dynamically adjust the maximum sub-packet count. This feedback mechanism allows the system to know when to apply early termination for throughput improvement and when to ensure complete transmission for reliability, resolving the contradiction through condition-based decision making.
Data Source
AI summary
There is provided a system and method for dynamically adjusting the maximum number of hybrid ARQ transmissions in a wireless system. More specifically, in one embodiment, there is provided a method comprising generating a plurality of hybrid ARQ sub-packets associated with a packet, wherein a transmitter is configured to transmit up to a maximum number of the hybrid ARQ sub-packets, detecting a degradation in transmission quality that affects the transmitter, and reducing the maximum number of hybrid ARQ sub-packets associated with the packet that can be transmitted by the transmitter in response to detecting the degradation.